NEW DESMODORIDAE (NEMATODA, DESMODOROIDEA) - 3 NEW SPECIES FROM CERIOPS MANGROVE SEDIMENTS (KENYA) AND ONE RELATED NEW SPECIES FROM THE NORTH-SEA

Three new species of nematodes (Chromaspirina okemwai sp.n., Pseudochr omadora interdigitatum sp, n. and Eubostrichus africanus sp. n.) from Ceriops mangrove sediments and one new species (Eubostrichus longoseto sus sp. n.) from the North Sea, along the Belgian coast, are described . Chromaspirina okemwai is characterized by four cephalic sensillae an d unispiral amphids; Pseudochromadora interdigitatum has unique latera l alae where body annules split into two, three or four smaller ones. Eubostrichus africanus has short (6 mu m) cephalic and subcervical set ae and five pairs of strong broad based setae at the tail region; Eubo strichus longosetosus has long (14 mu m) cephalic and subcervical seta e, three pairs of strong setae on the tail and two fine ones at the ta il tip. Eubostrichus parasitiferus as described by Hopper and Cefalu ( 1973) is given a new name, E. hopperi sp. n. A revision of the genus C hromaspirina and Pseudochromadora is also included.